Synotis baoshanensis (Asteraceae), a new species from Yunnan, China.
Synotis baoshanensis (Asteraceae), a new species from Yunnan, China.
复制标题
中国云南一新种Synotis baoshanensis（菊科）
DOI：
10.1186/1999-3110-54-17
复制
发表时间：
2013-12
影响因子：
3.4
通讯作者：
Yang QE
中科院分区：
文献类型：
--
作者：
Tang M;Hong Y;Yang QE
背景
雪莲是菊科、千里光属植物，约有55种，主要分布于中国-喜马拉雅地区。2012年，在中国西南部的一次植物学考察中，我们在云南省西南部发现了一个不寻常的滑舌虫种群。为了确定种群的分类学特性，我们进行了大体形态、花微形态和细胞学观察。
结果
我们的大体形态观察表明，该种群在叶形状和叶柄和小花的数量上最类似于Synotis aurrulata C.Jeffrey Y.L.Chen，但是很容易通过无毛的茎和叶柄(vs.腺状短柔毛)，外耳形的叶柄(vs.耳形)，最上面的叶明显小于中部的(vs.几乎相等的大小)，以及更大的射线小花(4-4.5毫米vs.约2.5毫米)区分。对该种群的花微形态观察与以前报道的滑舌草属其他种的情况一致。该种群的染色体数为2n=40。核型公式为2n=20m+14sm+6st。
结论
该种群被确定为代表一新种，即本文描述的宝山雪莲Synotis baoshanensis M.Tang Q.E.Yang。该种属于Synotis Ser。微舌板。
Background
Synotis (Asteraceae; Senecioneae) is a genus of about 55 species mostly distributed in the Sino-Himalayan region. During a botanical expedition in southwestern China in 2012, we found an unusual population of Synotis in southwestern Yunnan Province. To determine the taxonomic identity of the population, we carried out gross-morphological, floral micromorphological, and cytological observations.
Results
Our gross-morphological observations have shown that the population is most similar to Synotis auriculata C. Jeffrey Y. L. Chen in leaf shape and in the number of phyllaries and florets, but readily distinguishable by the glabrous stem and petiole (vs. glandular pubescent), the exauriculate petiole (vs. auriculate), the uppermost leaves obviously smaller than the middle ones (vs. almost equally sized), and the larger ray florets (4–4.5 mm vs. ca. 2.5 mm). The floral micromorphological observations on the population agree with previous reports for other species of Synotis. The chromosomes of the population are counted to be 2n = 40. Its karyotype is formulated as 2n = 20m + 14sm + 6st.
Conclusions
The population was determined to represent a new species, i.e. Synotis baoshanensis M. Tang Q. E. Yang, which is described herein. The species belongs to Synotis ser. Microglossae.